3 top most played (switch games)

Violet (over 250 hours on my main account)

Z-A (over 120 hours on my main account)

Scarlet (over 60 hours on my main account)

That's through the Switch's sort by Play Time sorting when viewing all software that counts Play Time across all users. I don't know the exact numbers because I don't have an account for every user I have (Play Time isn't shown for accountless users) and because Nintendo decided to just give extremely vague estimates after the 3DS' precise Play Time counter (it even counted erased/unsaved save data for the Play Time and counted how many times you've opened the game and when you first and last played it). If we only count my main account, it's:

Violet (over 250 hours)

Z-A (over 120 hours)

The Legend of Zelda: Breath of the Wild (over 70 hours) (and in all that time I still barely finished half the main story quests because I kept getting distracted)

I've had a Switch(2) for ~3 months. Top playtime is as follows:

Lego Star Wars(Skywalker Saga): 140 Hours

Pokémon Scarlet: 125 Hours

Legend of Zelda(Echoes of Wisdom): 85 Hours

Pokémon Z-A: 70 Hours(would be more if I ever get the DLC due to all the donut grinding)

TMNT Shredders Revenge: 30 Hours(and climbing as I unlock things in Survival mode. Have yet to do Arcade mode too)

N64 Classics: 20 Hours(Ocarina of Time here… much of it trying to remember where to go and me struggling on mini-games)

Madden 26: 2 Hours(plan to play this more but its a wide learning curve given I haven't played in like 20+ years lol)

I someday plan to get Smash but I suspect they may do a new installment of it since the N64 version debuted in January of 99 so it just turned 27. Don't be shocked if they do something for the 30th. Also, I may do Gen 10 but like any game I get, I want to know about the regional Dex(aka exclusives) to make a decision. Probably a few other games I might get down the line too but I haven't made up my mind.